MAGNETIC RECORDING MEDIUM, METHOD FOR MANUFACTURING MAGNETIC RECORDING MEDIUM, AND MAGNETIC RECORDING AND REPRODUCING DEVICE
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United States of America Patent
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Issued Date -
Apr 17, 2014
app pub date -
Oct 10, 2013
filing date -
Oct 11, 2012
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Abstract
A magnetic recording medium is disclosed in which, on a non-magnetic substrate 1, at least an orientation control layer that controls orientation of a layer immediately above and a vertical magnetic layer in which an easy axis of magnetization is mainly vertically oriented with respect to the non-magnetic substrate are laminated. The orientation control layer includes an Ru-containing layer containing Ru or Ru alloy, and a diffusion prevention layer provided on the Ru-containing layer on the side of the vertical magnetic layer, is made of a material having a melting point of 1500° C. or higher and 4215° C. or lower and formed by a covalent bond or an ionic bond, and prevents thermal diffusion of Ru atoms of the Ru-containing layer. The vertical magnetic layer has a crystalline structure of crystal grains continuously formed from the Ru-containing layer with the diffusion prevention layer interposed therebetween, and includes a columnar crystal continuously formed in a thickness direction together with the crystal grains.
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